According to his campaign website, De Leon has been a member of the State Allocation Board and was chairman of the California State Assembly's Appropriations Committee during his second term in that body. Senator De Leon is originally from San Diego.

The following are the top ten contributors to De Leon's campaign by interest group:

Interest

Contributions

General Trade Unions

$272,250

Public Sector Unions

$202,832

Insurance

$144,076

Lawyers & Lobbyists

$131,610

Health Professionals

$82,199

Real Estate

$76,100

Tribal Governments

$63,500

Gambling & Casinos

$61,150

Beer, Wine & Liquor

$56,850

Telecom Services & Equipment

$56,800

Contributions above are for the last four years of available data, Jul 1, 2006 - Jun 30, 2010. Contributions from political parties and from other candidates are not included in the "Top 10" lists. Contributions data provided by the National Institute on Money in State Politics (FollowTheMoney.org).